A Novel Microstrip Triple Wideband Bandstop Filter Design by Using Adjacent Direct Coupled Dual-Mode Resonators

Purpose The purpose of this paper is to present the design of a compact microstrip bandpass filter (BPF) in dual-mode configuration loaded with cross-loop and square ring slots on a square patch resonator for C-band applications. Design/methodology/approach In the proposed design, the dual-mode response for the filter is realized with two transmission zeros (TZs) by the insertion of a perturbation element at the diagonal corner of the square patch resonator with orthogonal feed lines. Such TZs at the edges of the passband result in better selectivity for the proposed BPF. Moreover, the cross-loop and square ring slots are etched on a square patch resonator to obtain a miniaturized BPF. Findings The proposed dual-mode microstrip filter fabricated in RT/duroid 6010 substrate using PCB technology has a measured minimum insertion loss of 1.8 dB and return loss better than 24.5 dB with a fractional bandwidth (FBW) of 6.9%. A compact size of 7.35 × 7.35 mm2 is achieved for the slotted patch resonator-based dual-mode BPF at the center frequency of 4.76 GHz. As compared with the conventional square patch resonator, a size reduction of 61% is achieved with the proposed slotted design. The feasibility of the filter design is confirmed by the good agreement between the measured and simulated responses. The performance of the proposed filter structure is compared with other dual-mode filter works. Originality/value In the proposed work, a compact dual-mode BPF is reported with slotted structures. The conventional square patch resonator is deployed with cross-loop and square ring slots to design a dual-mode filter with a square perturbation element at its diagonal corner. The proposed filter exhibits compact size and favorable performance compared to other dual-mode filter works reported in literature. The aforementioned design of the dual-mode BPF at 4.76 GHz is suitable for applications in the lower part of the C-band.

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Neural Network Method for Dual-Mode Dual-Band DSPSL Bandpass Filter Design

International Journal of Digital Content Technology and its Applications ◽

10.4156/jdcta.vol6.issue9.16 ◽

2012 ◽

Vol 6 (9) ◽

pp. 125-131

Author(s):

Shan Wang ◽

Yao Wang ◽

Yang Jiang ◽

Haiwen Liu

Keyword(s):

Neural Network ◽

Bandpass Filter ◽

Filter Design ◽

Dual Band ◽

Dual Mode ◽

Neural Network Method ◽

Network Method

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Compact multiple bandstop filter using integrated circuit of defected microstrip structure (DMS) and dual-mode resonator

AEU - International Journal of Electronics and Communications ◽

10.1016/j.aeue.2019.05.039 ◽

2019 ◽

Vol 107 ◽

pp. 209-214 ◽

Cited By ~ 2

Author(s):

Raaed T. Hammed ◽

Bashar H. Hameed

Keyword(s):

Integrated Circuit ◽

Dual Mode ◽

Bandstop Filter ◽

Microstrip Structure ◽

Mode Resonator

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Bandpass/bandstop filter design in circular waveguide

Microwave and Optical Technology Letters ◽

10.1002/mop.4650080502 ◽

1995 ◽

Vol 8 (5) ◽

pp. 229-230

Author(s):

P. R. Clark ◽

G. L. James

Keyword(s):

Filter Design ◽

Circular Waveguide ◽

Bandstop Filter

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A novel compact quad-band microstrip bandstop filter design using open-circuited stubs

2013 IEEE MTT-S International Microwave Symposium Digest (MTT) ◽

10.1109/mwsym.2013.6697483 ◽

2013 ◽

Cited By ~ 2

Author(s):

Ceyhun Karpuz ◽

Adnan Gorur ◽

Ali Kursad Gorur ◽

Ahmet Ozek

Keyword(s):

Filter Design ◽

Bandstop Filter

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Bandwidth-enhanced lumped-element absorptive bandstop filter topology and its application to LTCC bandstop filter design

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078714001147 ◽

2014 ◽

Vol 7 (6) ◽

pp. 691-698 ◽

Cited By ~ 10

Author(s):

Juseop Lee ◽

Byungguk Kim ◽

Kangho Lee ◽

William J. Chappell

Keyword(s):

Low Temperature ◽

Filter Design ◽

Second Order ◽

Center Frequency ◽

Q Factor ◽

First Order ◽

Lumped Element ◽

Bandstop Filter ◽

Analytic Design ◽

Order Four

In this paper, we show a second-order (four-resonator) absorptive bandstop filter circuit topology which gives a larger bandwidth compared to a first-order topology. Due to the absorptive characteristic, it creates a large attenuation at the center frequency using low-Q resonators. Since low-Q resonators can be used in generating a large attenuation, small-size resonators can be employed in bandstop filter design. Analytic design equations are provided so that a higher-order absorptive bandstop filter can be designed analytically. It is also shown that the second-order filter topology exhibits a better frequency selectivity having a same bandwidth. The proposed filter topology has been applied to a design of a miniaturized low-temperature co-fired ceramic bandstop filter with low-Q resonators. The Q-factor of the lumped-element resonators has been chosen to be 5 for demonstration.

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